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Acetal

Acetal is Widely Used For:

  • Bearings and bushings
  • Pump and valve parts
  • Manifolds
  • Gears
  • Jigs and fixtures
  • Food processing and other
    packaging machinery parts
  • Wear pads
  • Electrical components

Performance Characteristics:

  • Strong and stiff
  • Excellent machinability
  • Low moisture absorption
  • Excellent wear properties in both
    wet and dry environments
  • Low friction
  • Good chemical resistance

Common Brands:

  • Delrin®
  • SUSTARIN®
  • TECAFORM®
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Acetal

High strength, stiff, low friction engineering plastic with good wear properties

Acetal (polyoxymethylene or POM) is a high strength, low friction engineering plastic that has excellent wear properties in both wet and dry environments. Acetal is chemically resistant to hydrocarbons, solvents, and neutral chemicals. Easy to machine, acetal makes an outstanding choice for applications that require complex, tight tolerances.

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STANDARD SIZES
SHEET Dimensions:
6 in x 12 in – 48 in x 120 in
Thickness:
0.031 in – 6 in
ROD Diameter:
0.187 in – 12 in
TUBE Outside Diameter:
25 mm – 230 mm
OPTIONS AVAILABLE
COLOR Sheet:
Natural, Black, Brown, Blue, Green, Fluorescent Green, Fluorescent Pink, Orange, Purple, Red, Yellow

Rod:
Natural, Black, Brown, Blue, Green 

Tube:
Natural
GRADES Static Dissipative, Glass-Filled, Enhanced Bearing and Wear, FDA Compliant, Medical

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes and colors available upon request.
 

Acetal Properties and Material Options

Homopolymer vs. Copolymer– Acetal is available in both homopolymer (Delrin® 150) and copolymer.

  • Homopolymer acetal (Delrin®) has superior room temperature strength, stiffness, and toughness.
  • Copolymer acetal has excellent performance in continuous high heat and hot water environments. Copolymer acetal also tends to have less porosity than homopolymer acetal. 

FDA Compliant Material– Acetal is available in FDA compliant grades.

Acetal Grades– Acetal is available in a number of grades, including enhanced bearing and wear Delrin® AF, Delrin® 100AF blend, Delrin® AF DE588, and TECAFORM® HPV13. Delrin® 511P is a homopolymer acetal that offers enhanced crystallization characteristics. This higher level of crystallization helps to augment aspects of the physical properties such as fatigue strength, stiffness, and creep resistance.
Ask about special formulations that offer medical, metal detectable, x-ray detectable, or static dissipative grades.

Chemical Attack– Acetal is chemically resistant to many fuels and solvents.

Wear Resistance– Acetal offers good wear and abrasion properties.

Tech Tip– Glass-filled grades of acetal offer enhanced strength and stiffness such as Delrin® 570.

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Typical properties of ACETAL
  UNITS ASTM
TEST		 HOMOPOLYMER
ACETAL		 COPOLYMER
ACETAL		 TECAFORM®
HPV13
PTFE-FILLED
ACETAL		 20% GLASS
FIBER FILLED
HOMOPOLYMER
ACETAL
Tensile strength psi D638 10,000 9,800 6,800 8,500
Flexural modulus psi D790 420,000 370,000 350,000 730,000
Izod impact (notched) ft-lbs/in
of notch		 D256 1.5 1.0 0.7 0.8
Heat deflection
temperature
@ 264 psi		 °F D648 257 230 244 316
Maximum continuous
service temperature
in air		 °F   185 195 185 185
Water absorption
(immersion
24 hours)		 % D570 0.25 0.20 0.22 0.25
Coefficient of
linear thermal
expansion		 in/in/
°Fx10-5		 D696 6.8 6.1 5.1 2.0 - 4.5
Coefficient of
friction (dynamic)		     0.20 0.21 0.12 0.35

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.

Need more information about this material? Use our interactive plastic properties table

 

Homopolymer Acetal vs Copolymer Acetal Tensile Strengths: Long Term Effects of Boiling Water on Tensile Strengths